What you're missing is that the current fact we have at hand now is that he won against you (resoundingly). Even 'proving' that he's a moron doesn't put you in a better light compared to him, because you still lost to him. Treating him like a clueless idiot has only hurt you, and will hurt you even more now that you lost to him.
No, but it's stupid to mock the intelligence of somebody who has just beaten you. You might not realize this because of how strongly you feel about him and how biased this place is, but for anybody who doesn't feel as strongly as you about him, it doesn't really make much sense.
However you're absolutely entitled to question his actions. Actually that is what you should be doing.